Comparisons, predictions, and applications

Article Abstract:

Optimized thermodynamic data for olivine, garnet, orthopyroxene, cordierite and ilmenite enable accurate prediction of phase relationships/compositions of solid solutions. A comparative study of temperature estimates of several exchange and net-transfer reactions of high-grade terranes demonstrates the capability of Fe-Mg minerals to preserve high temperature steady state information during the evolutionary process. The thermodynamic results are not only in good agreement with direct experimental observations, but may also be applied to both petrogenetic grid and thermobarometric calculations.

Ilmenite, Petrogenesis

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Model calibration for olivine, orthopyroxene, cordierite, garnet, and ilmenite in the system FeO-MgO-CaO-Al2O3-TiO2-SiO2

Article Abstract:

Phase equilibrium surveys of the FeO-MgO-CaO-Al2O3-TiO2-SiO2-H2O system enables reasonably accurate representation of data for seven linearly dependent Fe-Mg exchange equilibria as well as net transfer equilibria. A mathematical programming technique not only accounts for the bulk composition constraints, but also provides a range of internally consistent mixing properties for orthopyroxene, olivine, cordierite, garnet and ilmenite. The programming approach optimizes the tight constraints on endmember properties while exploiting macroscopic solution models for extrapolating the data.

Mineralogy, Determinative, Determinative mineralogy

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Thermodynamics of aluminosilicate garnet solid solution: new experimental data, an optimized model, and thermometric applications

Article Abstract:

A study of the equilibrium of Grossular + 2 Kyanite + Quartz = 3 Anorthite as a function of garnet composition in the Mg-Ca-Mn, Fe-Mg-Ca and Fe-Mg-Ca-Mn systems gives a range of mutually compatible binary mixing parameters of the quaternary Fe-Mg-Ca-Mn aluminosilicate garnet solid solution. Analysis of the binary/ternary miscibility gaps in natural samples shows the impossibility of achieving the P, T, X combination that unmixes garnet solid solutions. The mixing parameters are consistent with both experimental and natural phase equilibrium constraints.

Garnet

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